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Reports <code>sealed</code> classes without an explicit <code>permits</code> list.
Sealed classes that only have subclasses in the same file are not required to have an explicit <code>permits</code> list.
By default, this inspection does not highlight in the editor, but only provides a fix.
<p>Example:</p>
<pre><code>
  sealed class A {}
  final class B extends A {}
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  sealed class A permits B {}
  final class B extends A {}
</code></pre>
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<p><small>New in 2020.3</small></p>
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